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EP1182019A1 - Electric power tool with quick clamping device for working tool - Google Patents

Electric power tool with quick clamping device for working tool Download PDF

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Publication number
EP1182019A1
EP1182019A1 EP20010810763 EP01810763A EP1182019A1 EP 1182019 A1 EP1182019 A1 EP 1182019A1 EP 20010810763 EP20010810763 EP 20010810763 EP 01810763 A EP01810763 A EP 01810763A EP 1182019 A1 EP1182019 A1 EP 1182019A1
Authority
EP
European Patent Office
Prior art keywords
clamping
spindle
tool
power tool
lever
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20010810763
Other languages
German (de)
French (fr)
Other versions
EP1182019B1 (en
Inventor
Markus Hartmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
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Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP1182019A1 publication Critical patent/EP1182019A1/en
Application granted granted Critical
Publication of EP1182019B1 publication Critical patent/EP1182019B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29—Details; Component parts; Accessories
    • B27B5/30—Details; Component parts; Accessories for mounting or securing saw blades or saw spindles
    • B27B5/32—Devices for securing circular saw blades to the saw spindle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/16—Longitudinal screw clamp
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/33—Member applies axial force component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/59—Manually releaseable latch type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18888—Reciprocating to or from oscillating
    • Y10T74/1892—Lever and slide
    • Y10T74/1896—Cam connections
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20636—Detents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9377—Mounting of tool about rod-type shaft
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9377—Mounting of tool about rod-type shaft
    • Y10T83/9379—At end of shaft
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9403—Disc type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9457—Joint or connection
    • Y10T83/9461—Resiliently biased connection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9457—Joint or connection
    • Y10T83/9464—For rotary tool

Definitions

  • the invention relates to a power tool, in particular circular saws and the like a motor mounted in a housing that drives a hollow spindle and a quick release device to hold a tool
  • the quick release device a has in the hollow spindle coaxially displaceably mounted clamping spindle, which by a elastic element is axially clamped and by means of one facing away from the tool Arranged end of the clamping spindle, clamping lever, which has an axis of rotation at one end has and between a clamping position in which the tool on the hollow spindle rotatably is clamped, and a changing position, is movable and the tool between a clamping flange that can be attached to the tool-side end of the clamping spindle and the Hollow spindle is mounted braced.
  • Power tools of the type mentioned above have a quick-action clamping device in order to to enable manual changing of a tool.
  • No auxiliary tool is required in the case of clamp tensioning devices to relax or to relax.
  • a wrench as an auxiliary tool, for example the tool switch.
  • the quick release device can be used, for example a clamping lever can be operated, for example to change the tool.
  • Such a power tool is known from DE-C2-4336620, with one in one Housing mounted motor that drives a hollow spindle and a quick release device for holding a tool.
  • the quick release device has one in the Hollow spindle coaxially displaceable clamping spindle by an elastic element is axially clamped.
  • the quick release device is between a Clamping position and a change position adjustable.
  • the tool is in the clamping position between the hollow spindle and a clamping flange.
  • an eccentric is arranged over a Pin rests on the clamping spindle.
  • the advantage of this known solution is that the tool without auxiliary tools, such as for example a wrench, can be changed.
  • the user provides the Into the change position and turn the clamping flange off the clamping spindle and can thus remove the tool, for example, from the clamping device or also reposition.
  • a disadvantage of the known solution is the actuating characteristic of the clamping lever.
  • the operating force to be exerted by the user for the setting process is great, because high friction losses occur between the clamping lever and the clamping spindle.
  • the tensioning lever can be in an intermediate position in which the tensioning device is neither tense nor relaxed.
  • the present invention has for its object an electric tool with a To create quick release device that tensions without great operator effort by the user and can be relaxed. Furthermore, the quick release device should be clearly in one of the two states are located and be economically producible.
  • the object is achieved in that the clamping lever in a radial Distance has a sliding element, which by pivoting the clamping lever about the axis of rotation with a deflection in relation to the longitudinal axis of the clamping spindle in contact with the end of the clamping spindle facing away from the tool can be brought, the clamping spindle has a contact surface with an extension in the pivoting direction, which at least corresponds to the sin (deflection) times the distance.
  • the fact that the tensioning lever has a sliding element means that the user has to apply it Operating force is small because of the friction between the clamping spindle and the sliding element is very small. This is particularly useful for quick clamping devices with high clamping force Characteristic a considerable reduction in the operating force to be applied. There is also through the choice of the sliding element, it can be adapted to the required clamping force of the elastic element. If a high clamping force is required, there is, for example the possibility of using expensive sliding elements and thus very good ones To achieve sliding properties. In addition, in contrast to known solutions Quick release devices, the wear and tear when using a sliding element less, which means the service life even if the power tool is used excessively significantly extended. The dimensioning of the contact surface ensures one if possible compact design of the quick release mechanism in the power tool and promotes among other things, its manageability.
  • the deflection is 30 ° to 120 ° to a good one To ensure the positioning characteristics of the quick release device.
  • the choice of deflection also determines the stroke distance between the hollow spindle and the clamping spindle. The greater the deflection, the greater the stroke distance between the clamping position and the changing position.
  • a long stroke also means less compact design Quick clamping device, since the extension of the contact surface with the deflection increased. In particular, for example in the case of hand-held circular saws, there has been a deflection of 80 ° proved to be optimal.
  • the distance and the longitudinal axis included end angles between 5 ° and 30 °.
  • the cocking lever either swivels in the clamping position or in the change position.
  • the exact position of the clamping lever is determined by, for example, a stop surface. If necessary, the end angle ensures swiveling into the change position. ever the larger the end angle is chosen, the more stroke distance goes through the backward movement the clamping spindle is lost against the direction of the tool. On the other hand, the end angle snaps securely into the change position.
  • the end angle is preferably 10 ° in order to ensure an optimal snapping in ensure compact design.
  • the sliding element is advantageously by a bearing element parallel to the axis of rotation with a radius formed to be economical and at the same time for high clamping forces to ensure appropriate solution.
  • Bearing elements are extremely resilient and are characterized by low friction and a long service life. Also is their production economically, since there is a great need for such elements.
  • the radius corresponds to a preferred one Embodiment 0.2 to 0.6 times, in particular 0.4 times the distance.
  • the quick release device has a clamping spindle mounted coaxially displaceably in the hollow spindle 2 4, which is axially braced by an elastic element 5.
  • the elastic element 5 has one end in an end of the hollow spindle facing away from the tool 2 arranged step hole and is stored at the opposite end held by a flange 13 fastened to the clamping spindle 4.
  • the clamping lever 6 is the Quick clamping device between a clamping position, as can be seen in particular from FIG. 1 and a change position, in particular shown in FIG. 2, can be set. In the The clamping position is the tool 3 between the hollow spindle 2 and a clamping flange 7 established.
  • the tensioning lever 6 By pivoting the tensioning lever 6 from the tensioning position, shown in particular in FIG. 1 in the change position, which is shown in particular in Fig. 2, the Clamping spindle 4 by a sliding element 8, in particular by an annular bearing element, axially displaced towards the tool 3 against the force of the elastic element 5.
  • the sliding element 8 has a radial distance a from an axis of rotation 9 of the clamping lever 6 on.
  • the clamping flange 7 can be used without the aid of an auxiliary tool are rotated, for example, between the clamping flange 7 and the hollow spindle 2 stored tool 3 to be replaced.
  • the clamping lever 6 is against a stop surface 12 of the housing 1 pressed.
  • Fig. 2 shows the clamping lever 6 in a position in which it is in contact with the clamping spindle 4 stands, but does not yet exert any force on the elastic element 5.
  • a position closes the longitudinal axis of the clamping spindle 4 with the radial distance a between the Axis of rotation 9 and the sliding element 8 an angle ⁇ , which is approximately 80 °.
  • a contact area 11 has an extension K in the pivoting direction that is approximately sin ( ⁇ ) times corresponds to the distance a.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Gripping On Spindles (AREA)
  • Sawing (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The device has a motor in a housing driving a hollow spindle and a fast clamp. A clamping lever has a slide element that can be can be brought into contact with a clamp spindle end remote from the tool by rotating the lever. The clamp spindle has a contact surface whose dimension in the pivoting direction is at least the product of the sine of the slide element deflection angle and its radial distance from the rotation axis. The device has a motor in a housing driving a hollow spindle (2) and a fast clamp for holding a tool with a clamp spindle (4) coaxially movable in the hollow spindle and a clamp lever (6) movable between tool clamping and replacement positions. The clamping lever has a slide element (8) that can be can be brought into contact with the clamp spindle end remote from the tool by rotating the lever. The clamp spindle has a contact surface (11) whose dimension (K) in the pivoting direction is at least the product of the sine of the slide element deflection angle (alpha) and its radial distance (a) from the rotation axis (9)..

Description

Die Erfindung betrifft ein Elektrowerkzeug, insbesondere Kreissägen und dergleichen mit einem in einem Gehäuse gelagerten Motor, der eine Hohlspindel antreibt und einer Schnellspanneinrichtung zur Aufnahme eines Werkzeuges, wobei die Schnellspanneinrichtung eine in der Hohlspindel koaxial verschieblich gelagerten Spannspindel aufweist, die durch ein elastisches Element axial verspannt ist und mittels eines, einem werkzeugseitig abgewandten Ende der Spannspindel angeordneten, Spannhebels, der an einem Ende eine Drehachse aufweist und zwischen einer Spannposition, in der das Werkzeug an der Hohlspindel drehfest verspannt ist, und einer Wechselposition, bewegbar ist und das Werkzeug zwischen einem am werkzeugseitigen Ende der Spannspindel aufbringbaren Spannflansch und der Hohlspindel verspannbar gelagert ist.The invention relates to a power tool, in particular circular saws and the like a motor mounted in a housing that drives a hollow spindle and a quick release device to hold a tool, the quick release device a has in the hollow spindle coaxially displaceably mounted clamping spindle, which by a elastic element is axially clamped and by means of one facing away from the tool Arranged end of the clamping spindle, clamping lever, which has an axis of rotation at one end has and between a clamping position in which the tool on the hollow spindle rotatably is clamped, and a changing position, is movable and the tool between a clamping flange that can be attached to the tool-side end of the clamping spindle and the Hollow spindle is mounted braced.

Elektrowerkzeuge der oben genannten Art weisen eine Schnellspanneinrichtung auf, um ein manuelles Wechseln eines Werkzeuges zu ermöglichen. Im Gegensatz zu bekannten Spanneinrichtungen ist bei Schellspanneinrichtungen kein Hilfswerkzeug nötig, um die Spanneinrichtung zu entspannen oder zu spannen. Beispielsweise kann eine derartige bekannte Spanneinrichtung aus einer Gewindestange mit einem fest an dieser befestigten Spannflansch und einer Mutter bestehen. Bei dieser bekannten Lösung ist der Anwender gezwungen, einen Gabelschlüssel als Hilfswerkzeug zu benutzen, um beispielsweise das Werkzeug zu wechseln. Im Gegensatz dazu, kann die Schnellspanneinrichtung beispielsweise über einen Spannhebel betätigt werden, um beispielsweise das Werkzeug zu wechseln.Power tools of the type mentioned above have a quick-action clamping device in order to to enable manual changing of a tool. In contrast to known tensioning devices No auxiliary tool is required in the case of clamp tensioning devices to relax or to relax. For example, such a known one Clamping device from a threaded rod with a clamping flange firmly attached to it and a mother. With this known solution, the user is forced to to use a wrench as an auxiliary tool, for example the tool switch. In contrast to this, the quick release device can be used, for example a clamping lever can be operated, for example to change the tool.

Ein derartiges Elektrowerkzeug ist aus der DE-C2-4336620 bekannt, mit einem in einem Gehäuse gelagerten Motor, der eine Hohlspindel antreibt und eine Schnellspanneinrichtung zur Aufnahme eines Werkzeuges aufweist. Die Schnellspanneinrichtung weist eine in der Hohlspindel koaxial verschieblich gelagerte Spannspindel auf, die durch ein elastisches Element axial verspannt ist. Mittels eines an einem werkzeugseitig abgewandten Ende der Spannspindel angeordneten Spannhebels, ist die Schnellspanneinrichtung zwischen einer Spannposition und einer Wechselposition stellbar. In der Spannposition ist das Werkzeug zwischen der Hohlspindel und einem Spannflansch festgelegt. An einem Ende mit dem der Spannhebel an einer Drehachse festgelegt ist, ist ein Exzenter angeordnet, der über einen Bolzen an der Spannspindel anliegt. Durch Schwenken des Spannhebels in die Wechselposition wird die Spannspindel durch den Exzenter gegen die Kraft des elastischen Elementes und der zwischen dem Exzenter und dem Bolzen entstehenden Reibung axial in Richtung Werkzeug verschoben. In dieser Position kann der Spannflansch ohne Zuhilfenahme eines Hilfswerkzeuges verdreht werden, um beispielsweise das Werkzeug auszuwechseln.Such a power tool is known from DE-C2-4336620, with one in one Housing mounted motor that drives a hollow spindle and a quick release device for holding a tool. The quick release device has one in the Hollow spindle coaxially displaceable clamping spindle by an elastic element is axially clamped. By means of an end of the Arranged clamping lever, the quick release device is between a Clamping position and a change position adjustable. The tool is in the clamping position between the hollow spindle and a clamping flange. At one end with that of Clamping lever is fixed on an axis of rotation, an eccentric is arranged over a Pin rests on the clamping spindle. By swiveling the clamping lever into the change position is the clamping spindle by the eccentric against the force of the elastic element and the axial friction between the eccentric and the bolt Tool moved. In this position the clamping flange can be used without a Auxiliary tool are rotated, for example, to replace the tool.

Vorteilhaft an dieser bekannten Lösung ist, dass das Werkzeug ohne Hilfswerkzeug, wie beispielsweise einem Gabelschlüssel, gewechselt werden kann. Der Anwender stellt den Spannhebel in die Wechselposition und dreht die Spannflansch von der Spannspindel ab und kann somit das Werkzeug beispielsweise aus der Spannvorrichtung entnehmen oder auch neu positionieren.The advantage of this known solution is that the tool without auxiliary tools, such as for example a wrench, can be changed. The user provides the Into the change position and turn the clamping flange off the clamping spindle and can thus remove the tool, for example, from the clamping device or also reposition.

Nachteilig an der bekannten Lösung wirkt sich die Stellcharakteristik des Spannhebels aus. Einerseits ist die vom Anwender aufzubringende Bedienkraft für den Stellvorgang gross, da hohe Reibungsverluste zwischen Spannhebel und Spannspindel auftreten. Und andererseits kann sich der Spannhebel in einer Zwischenstellung befinden, in der die Spannvorrichtung weder verspannt noch entspannt ist.A disadvantage of the known solution is the actuating characteristic of the clamping lever. On the one hand, the operating force to be exerted by the user for the setting process is great, because high friction losses occur between the clamping lever and the clamping spindle. And on the other hand the tensioning lever can be in an intermediate position in which the tensioning device is neither tense nor relaxed.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Elektrowerkzeug mit einer Schnellspanneinrichtung zu schaffen, die ohne grosse Bedienkraft vom Anwender verspannt und entspannt werden kann. Ferner soll sich die Schnellspannvorrichtung eindeutig in einem der beiden Zustände befinden und wirtschaftlich herstellbar sein.The present invention has for its object an electric tool with a To create quick release device that tensions without great operator effort by the user and can be relaxed. Furthermore, the quick release device should be clearly in one of the two states are located and be economically producible.

Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass der Spannhebel in einem radialen Abstand ein Gleitelement aufweist, das durch Verschwenken des Spannhebels um die Drehachse unter einer Auslenkung gegenüber der Längsachse der Spannspindel in Kontakt mit dem werkzeugseitig abgewandten Ende der Spannspindel bringbar ist, wobei die Spannspindel eine Kontaktfläche mit einer Ausdehnung in Schwenkrichtung aufweist, die zumindest dem sin(Auslenkung)-fachen des Abstandes entspricht.According to the invention the object is achieved in that the clamping lever in a radial Distance has a sliding element, which by pivoting the clamping lever about the axis of rotation with a deflection in relation to the longitudinal axis of the clamping spindle in contact with the end of the clamping spindle facing away from the tool can be brought, the clamping spindle has a contact surface with an extension in the pivoting direction, which at least corresponds to the sin (deflection) times the distance.

Dadurch, dass der Spannhebel ein Gleitelement aufweist, ist die vom Anwender aufzubringende Bedienkraft klein, da die Reibung zwischen der Spannspindel und dem Gleitelement sehr klein ist. Insbesondere bei Schnellspannvorrichtungen mit hoher Spannkraft bringt dieses Merkmal eine erhebliche Reduzierung der aufzubringenden Bedienkraft. Ferner besteht durch die Wahl des Gleitelementes eine Anpassungsmöglichkeit an die geforderte Spannkraft des elastischen Elements. Wird eine grosse Spannkraft gefordert, so besteht beispielsweise die Möglichkeit, kostspielige Gleitelemente einzusetzen und somit sehr gute Gleiteigenschaften zu erreichen. Ausserdem sind, im Gegensatz zu bekannten Lösungen mit Schnellspanneinrichtungen, beim Einsatz eines Gleitelementes die Verschleisserscheinungen geringer, was die Standzeit auch bei übermässiger Beanspruchung des Elektrowerkzeuges erheblich verlängert. Die Dimensionierung der Kontaktfläche gewährleistet eine möglichst kompakte Konstruktion des Schnellspannmechanismus im Elektrowerkzeug und fördert damit unter anderem dessen Handlichkeit.The fact that the tensioning lever has a sliding element means that the user has to apply it Operating force is small because of the friction between the clamping spindle and the sliding element is very small. This is particularly useful for quick clamping devices with high clamping force Characteristic a considerable reduction in the operating force to be applied. There is also through the choice of the sliding element, it can be adapted to the required clamping force of the elastic element. If a high clamping force is required, there is, for example the possibility of using expensive sliding elements and thus very good ones To achieve sliding properties. In addition, in contrast to known solutions Quick release devices, the wear and tear when using a sliding element less, which means the service life even if the power tool is used excessively significantly extended. The dimensioning of the contact surface ensures one if possible compact design of the quick release mechanism in the power tool and promotes among other things, its manageability.

In einer bevorzugten Ausführungsform beträgt die Auslenkung 30° bis 120°, um eine gute Stellcharakteristik der Schnellspannvorrichtung zu gewährleisten. Die Wahl der Auslenkung bestimmt ferner den Hubweg zwischen Hohlspindel und Spannspindel. Je grösser die Auslenkung, desto grösser ist der Hubweg zwischen der Spannposition und der Wechselposition. Jedoch bedeutet ein grosser Hubweg auch eine weniger kompakte Ausbildung der Schnellspannvorrichtung, da sich die Ausdehnung der Kontaktfläche mit der Auslenkung vergrössert. Insbesondere hat sich beispielsweise bei handgeführten Kreissägen, eine Auslenkung von 80° als optimal erwiesen.In a preferred embodiment, the deflection is 30 ° to 120 ° to a good one To ensure the positioning characteristics of the quick release device. The choice of deflection also determines the stroke distance between the hollow spindle and the clamping spindle. The greater the deflection, the greater the stroke distance between the clamping position and the changing position. However, a long stroke also means less compact design Quick clamping device, since the extension of the contact surface with the deflection increased. In particular, for example in the case of hand-held circular saws, there has been a deflection of 80 ° proved to be optimal.

Vorteilhafterweise beträgt in der Wechselposition der durch den Abstand und die Längsachse eingeschlossene Endwinkel zwischen 5° und 30°. Damit werden undefinierte Zwischenstellungen der Schnellspannvorrichtung ausgeschlossen. Der Spannhebel schwenkt entweder in die Spannposition oder in die Wechselposition. Insbesondere in der Wechselposition, ist durch beispielsweise eine Anschlagfläche die genaue Position des Spannhebels festgelegt. Der Endwinkel stellt gegebenenfalls ein Schwenken in die Wechselposition sicher. Je grösser der Endwinkel gewählt wird, desto mehr Hubweg geht durch die Rückwärtsbewegung der Spannspindel entgegen der Richtung des Werkzeuges verloren. Andererseits stellt der Endwinkel ein Einschnappen in die Wechselposition sicher.Advantageously in the change position is the distance and the longitudinal axis included end angles between 5 ° and 30 °. This creates undefined intermediate positions the quick release device excluded. The cocking lever either swivels in the clamping position or in the change position. Especially in the change position, the exact position of the clamping lever is determined by, for example, a stop surface. If necessary, the end angle ensures swiveling into the change position. ever the larger the end angle is chosen, the more stroke distance goes through the backward movement the clamping spindle is lost against the direction of the tool. On the other hand, the end angle snaps securely into the change position.

Vorzugsweise beträgt der Endwinkel 10°, um ein optimales Einschnappen bei einer dennoch kompakten Bauweise sicherzustellen.The end angle is preferably 10 ° in order to ensure an optimal snapping in ensure compact design.

Das Gleitelement wird vorteilhafterweise durch ein zur Drehachse achsenparalleles Lagerelement mit einem Radius gebildet, um eine wirtschaftliche und zugleich für hohe Spannkräfte geeignete Lösung zu gewährleisten. Lagerelemente sind überaus hoch belastbar und zeichnen sich durch eine geringe Reibung und eine lange Lebensdauer aus. Ausserdem ist deren Herstellung wirtschaftlich, da ein grosser Bedarf an derartigen Elementen besteht.The sliding element is advantageously by a bearing element parallel to the axis of rotation with a radius formed to be economical and at the same time for high clamping forces to ensure appropriate solution. Bearing elements are extremely resilient and are characterized by low friction and a long service life. Also is their production economically, since there is a great need for such elements.

Um eine optimale Stellcharakteristik zu erhalten, entspricht der Radius in einer bevorzugten Ausführungsform dem 0,2- bis 0,6-fachen, insbesondere 0,4-fache des Abstandes.In order to obtain an optimal positioning characteristic, the radius corresponds to a preferred one Embodiment 0.2 to 0.6 times, in particular 0.4 times the distance.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispieles näher erläutert. Es zeigen:

Fig. 1
einen Querschnitt der Schnellspanneinrichtung in einer Wechselposition
Fig. 2
einen Querschnitt der Schnellspanneinrichtung in einer Position, in der eine Spannspindel in Kontakt mit einem Gleitelement ist.
The invention is explained in more detail below using an exemplary embodiment. Show it:
Fig. 1
a cross section of the quick release device in a changing position
Fig. 2
a cross section of the quick release device in a position in which a clamping spindle is in contact with a sliding element.

In den Fig. 1 und 2 ist ein erfindungsgemässes Elektrowerkzeug mit einem in einem Gehäuse 1 gelagerten, nicht dargestellten Motor, der eine Hohlspindel 2 antreibt und einer Schnellspanneinrichtung zur Aufnahme eines Werkzeuges 3 im Querschnitt dargestellt. Die Schnellspanneinrichtung weist eine in der Hohlspindel 2 koaxial verschieblich gelagerten Spannspindel 4 auf, die durch ein elastisches Element 5 axial verspannt ist. Das elastische Element 5 ist mit einem Ende in einer an dem werkzeugseitig abgewandten Ende der Hohlspindel 2 angeordneten Stufenlochbohrung gelagert und wird am gegenüberliegenden Ende durch ein, an der Spannspindel 4 befestigten Flansch 13 gehalten. Mittels eines an einem werkzeugseitig abgewandten Ende der Spannspindel 4 angeordneten Spannhebels 6, ist die Schnellspanneinrichtung zwischen einer Spannposition, wie sie insbesondere aus Fig. 1 ersichtlich ist, und einer, insbesondere in Fig. 2 dargestellten Wechselposition stellbar. In der Spannposition ist das Werkzeug 3 zwischen der Hohlspindel 2 und einem Spannflansch 7 festgelegt.1 and 2 is a power tool according to the invention with a in a housing 1 mounted motor, not shown, which drives a hollow spindle 2 and a quick release device shown for receiving a tool 3 in cross section. The quick release device has a clamping spindle mounted coaxially displaceably in the hollow spindle 2 4, which is axially braced by an elastic element 5. The elastic element 5 has one end in an end of the hollow spindle facing away from the tool 2 arranged step hole and is stored at the opposite end held by a flange 13 fastened to the clamping spindle 4. Using one on one End of the clamping spindle 4 arranged on the tool side, the clamping lever 6 is the Quick clamping device between a clamping position, as can be seen in particular from FIG. 1 and a change position, in particular shown in FIG. 2, can be set. In the The clamping position is the tool 3 between the hollow spindle 2 and a clamping flange 7 established.

Durch Schwenken des Spannhebels 6 von der, insbesondere in Fig. 1 dargestellten, Spannposition in die Wechselposition, welche insbesondere in Fig. 2 dargestellt ist, wird die Spannspindel 4 durch ein Gleitelement 8, insbesondere durch ein ringförmiges Lagerelement, gegen die Kraft des elastischen Elementes 5 axial in Richtung Werkzeug 3 verschoben. Das Gleitelement 8 weist einen radialen Abstand a von einer Drehachse 9 des Spannhebels 6 auf. In dieser Position kann der Spannflansch 7 ohne Zuhilfenahme eines Hilfswerkzeuges verdreht werden um beispielsweise das zwischen Spannflansch 7 und Hohlspindel 2 gelagerte Werkzeug 3 auszuwechseln. Ein durch den Abstand a und die Längsachse der Spannspindel 4 eingeschlossener Endwinkel β, stellt ein Verharren der Spannspindel 4 in der Wechselposition sicher. Dabei wird der Spannhebel 6 gegen eine Anschlagfläche 12 des Gehäuses 1 gedrückt.By pivoting the tensioning lever 6 from the tensioning position, shown in particular in FIG. 1 in the change position, which is shown in particular in Fig. 2, the Clamping spindle 4 by a sliding element 8, in particular by an annular bearing element, axially displaced towards the tool 3 against the force of the elastic element 5. The sliding element 8 has a radial distance a from an axis of rotation 9 of the clamping lever 6 on. In this position, the clamping flange 7 can be used without the aid of an auxiliary tool are rotated, for example, between the clamping flange 7 and the hollow spindle 2 stored tool 3 to be replaced. One by the distance a and the longitudinal axis of the clamping spindle 4 included end angle β, remains the clamping spindle 4 safe in the change position. The clamping lever 6 is against a stop surface 12 of the housing 1 pressed.

Fig. 2 stellt den Spannhebel 6 in einer Position dar, in der er in Kontakt mit der Spannspindel 4 steht, jedoch noch keine Kraft auf das elastische Element 5 ausübt. In dieser Position schliesst die Längsachse der Spannspindel 4 mit dem radialen Abstand a zwischen der Drehachse 9 und dem Gleitelement 8 einen Winkel α ein, der etwa 80° beträgt. Eine Kontaktfläche 11 weist in Schwenkrichtung eine Ausdehnung K auf, die etwa dem sin(α)-fachen des Abstandes a entspricht.Fig. 2 shows the clamping lever 6 in a position in which it is in contact with the clamping spindle 4 stands, but does not yet exert any force on the elastic element 5. In this position closes the longitudinal axis of the clamping spindle 4 with the radial distance a between the Axis of rotation 9 and the sliding element 8 an angle α, which is approximately 80 °. A contact area 11 has an extension K in the pivoting direction that is approximately sin (α) times corresponds to the distance a.

Claims (8)

Elektrowerkzeug, insbesondere Kreissägen und dergleichen mit einem in einem Gehäuse (1) gelagerten Motor, der eine Hohlspindel (2) antreibt und eine Schnellspanneinrichtung zur Aufnahme eines Werkzeuges (3), wobei die Schnellspanneinrichtung eine in der Hohlspindel (2) koaxial verschieblich gelagerte Spannspindel (4) aufweist, die durch ein elastisches Element (5) axial verspannt ist und mittels eines einem werkzeugseitig abgewandten Ende der Spannspindel (4) angeordneten Spannhebel (6), der an einem Ende eine Drehachse (9) aufweist und zwischen einer Spannposition, in der das Werkzeug (3) an der Hohlspindel (2) drehfest verspannt ist, und einer Wechselposition, bewegbar ist und das Werkzeug (3) zwischen einem am werkzeugseitigen Ende der Spannspindel (4) aufbringbaren Spannflansch (7) und der Hohlspindel (2) verspannbar gelagert ist, dadurch gekennzeichnet, dass der Spannhebel (6) in einem radialen Abstand (a) ein Gleitelement (8) aufweist, das durch Verschwenken des Spannhebels (6) um die Drehachse (9) unter einer Auslenkung (α) gegenüber der Längsachse der Spannspindel (4) in Kontakt mit dem werkzeugseitig abgewandten Ende der Spannspindel (4) bringbar ist, wobei die Spannspindel (4) eine Kontaktfläche (11) mit einer Ausdehnung (K) in Schwenkrichtung aufweist, die zumindest dem sin(α)-fachen des Abstandes (a) entspricht.Power tool, in particular circular saws and the like, with a motor mounted in a housing (1) which drives a hollow spindle (2) and a quick-action clamping device for holding a tool (3), the quick-action clamping device comprising a clamping spindle (coaxially displaceably mounted in the hollow spindle (2)) 4), which is axially clamped by an elastic element (5) and by means of an end of the clamping spindle (4) facing away from the clamping lever (6) which has an axis of rotation (9) at one end and between a clamping position in which the tool (3) is non-rotatably clamped on the hollow spindle (2), and a changing position is movable, and the tool (3) is mounted so that it can be clamped between a clamping flange (7) that can be attached to the tool-side end of the clamping spindle (4) and the hollow spindle (2) , characterized in that the tensioning lever (6) has a sliding element (8) at a radial distance (a), which by pivoting the tensioning lever (6) about the axis of rotation (9) with a deflection (α) relative to the longitudinal axis of the clamping spindle (4) in contact with the end of the clamping spindle (4) facing away from the tool, the clamping spindle (4) having a contact surface (11) with an extension ( K) in the pivoting direction, which corresponds at least to sin (α) times the distance (a). Elektrowerkzeug nach Anspruch 1, dadurch gekennzeichnet, dass die Auslenkung (α) 30° bis 120° beträgt.Power tool according to claim 1, characterized in that the deflection (α) is 30 ° to 120 °. Elektrowerkzeug nach Anspruch 2, dadurch gekennzeichnet, dass die Auslenkung (α) 80° beträgt.Power tool according to claim 2, characterized in that the deflection (α) is 80 °. Elektrowerkzeug nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass in der Wechselposition der durch den Abstand (a) und die Längsachse eingeschlossene Endwinkel (β) zwischen 5° und 30° beträgt.Power tool according to one of claims 1 to 3, characterized in that in the changing position the end angle (β) enclosed by the distance (a) and the longitudinal axis is between 5 ° and 30 °. Elektrowerkzeug nach Anspruch 4, dadurch gekennzeichnet, dass der Endwinkel (β) 10° beträgt.Power tool according to claim 4, characterized in that the end angle (β) is 10 °. Elektrowerkzeug nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Gleitelement (8) durch ein zur Drehachse (9) achsenparalleles Lagerelement mit einem Radius (R) gebildet wird. Power tool according to one of claims 1 to 5, characterized in that the sliding element (8) is formed by a bearing element with a radius (R) parallel to the axis of rotation (9). Elektrowerkzeug nach Anspruch 6, dadurch gekennzeichnet, dass der Radius (R) dem 0,2- bis 0,6-fachen des Abstandes (a) entspricht.Power tool according to claim 6, characterized in that the radius (R) corresponds to 0.2 to 0.6 times the distance (a). Elektrowerkzeug nach Anspruch 7, dadurch gekennzeichnet, dass der Radius (R) dem 0,4-fachen des Abstandes (a) entspricht.Power tool according to claim 7, characterized in that the radius (R) corresponds to 0.4 times the distance (a).
EP20010810763 2000-08-17 2001-08-07 Electric power tool with quick clamping device for working tool Expired - Lifetime EP1182019B1 (en)

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DE2000140330 DE10040330A1 (en) 2000-08-17 2000-08-17 Power tool with clamping device
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DE10040330A1 (en) 2002-02-28
JP4827336B2 (en) 2011-11-30
DE50114985D1 (en) 2009-08-27
JP2002126944A (en) 2002-05-08
US20020035882A1 (en) 2002-03-28
US6953197B2 (en) 2005-10-11
EP1182019B1 (en) 2009-07-15

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